AN IMPERIAL PRESENTATION DIAMOND AND GUILLOCHÉ ENAMEL RING

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UNKNOWN MAKER, ST PETERSBURG, SECOND HALF 19TH CENTURY

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AN IMPERIAL PRESENTATION DIAMOND AND GUILLOCHÉ ENAMEL RING
UNKNOWN MAKER, ST PETERSBURG, SECOND HALF 19TH CENTURY
Oval, centring an ultramarine blue guilloché enamel cartouche with a diamond-set crowned initial for Grand Duchess Olga Nikolaevna (1822-1892), within two graduated rose-cut diamond borders, unmarked
7/8 in. (2.4 cm.) high